r0 20e-6[m] Spiral starting radius a1 10e-6[m] Coil width a2 10e-6[m] Photo resist width a_tot a1+a2 Spiral lap width laps 3 Number of revolved laps in spiral w_tot 2*pi*laps Total revolved angle c_ref 500[mol/m^3] Reference concentration in electrolyte D_Cu 4.5e-10 Diffusion coefficient d_dl 50e-6[m] Diffusion layer thickness Eeq_Cu 0.34[V] Equlibrium potential Cu/Cu d_pr 10e-6[m] Photoresist layer thickness i_avg -10[A/dm^2] Average cathode current density i0 10[A/m^2] Exchange current density alpha_a 1.5 Anode transfer coefficient alpha_c 0.5 Cathode transfer coefficient sigma 10[S/m] Electrolyte conductivity